1. Protect yourself: If you feel threatened or unsafe, leave this place immediately and make sure to find a place where you can provide support and help.

2. Collecting evidence: Collecting the time and place of the incident and related evidence, such as text messages and emails, will help to show the truth in subsequent reports and investigations.

3. Complain to the management department: complain to the management department of the fitness center or gym about the incident. They should be responsible for this kind of behavior and take appropriate measures to deal with the problem, including suspension of coaching qualification, investigation and corrective measures.